CLEANLOG.EXE purges entries from the XCOM for Windows log (XCOM.LOG). Items older the specified age are deleted. This assures that the file will not grow too large.
CLEANLOG <Number of days old> [Log file Name]
Number of days old Entries older than this will be purged.
Log file Name The name of the log file to clean (optional). The default is the XCOM.LOG in
the current directory.
CLEANLOG 5
This information is in the online documentation at
XCOM for Windows - Purge the Log File.
XCOM for Linux - Purge the Log File